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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7c966237346dd3e96a893538aa7981a2c3c826f76120cc67f9380a5a62ddaa1' 
  AND token = '/t9olE+E36qZqdAqVJNTsd5mJzxqzZbPaLWr2CJ2DNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}